After a standard system upgrade you need to reboot your computer toeffect the necessary changes.

Details follow:

A buffer overflow was discovered in libgd2's font renderer. By trickingan application using libgd2 into rendering a specially crafted stringwith a JIS encoded font, a remote attacker could read heap memory orcrash the application, leading to a denial of service. (CVE-2007-0455)

Xavier Roche discovered that libgd2 did not correctly validate PNGcallback results. If an application were tricked into processing aspecially crafted PNG image, it would monopolize CPU resources. Sincelibgd2 is often used in PHP and Perl web applications, this could leadto a remote denial of service. (CVE-2007-2756)